[New-bugs-announce] [issue31538] mailbox does not treat external factories the same

[bpoaugust]

New submission from bpoaugust:

The default mailbox factory is mailbox.mboxMessage so I expect the following two statements to work the same:

messages = mailbox.mbox("test.mbox")
messages = mailbox.mbox("test.mbox", mailbox.mboxMessage)

However they do not.

The attached file generates the output:

<class 'mailbox.mboxMessage'>
Test
sender at invalid Thu Nov 17 00:49:30 2016
None
<class 'mailbox.mboxMessage'>
Test
MAILER-DAEMON Thu Sep 21 01:31:15 2017
None

Note that the original from has been lost in the second parse.

----------
components: email
files: mb.py
messages: 302667
nosy: barry, bpoaugust, r.david.murray
priority: normal
severity: normal
status: open
title: mailbox does not treat external factories the same
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7
Added file: https://bugs.python.org/file47159/mb.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31538>
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